1. Default Styles for Custom Elements| drafts.csswg.org
1. Introduction| www.w3.org
1. Introduction| www.w3.org
serif | www.w3.org
1. Introduction| www.w3.org
1. About the CSS 2.2 Specification| drafts.csswg.org
1. Introduction| www.w3.org
Origin and Importance | www.w3.org
1. Introduction| www.w3.org
HTML| html.spec.whatwg.org
1. Introduction| www.w3.org
1. Introduction| www.w3.org
CSS Scoping Module Level 1| www.w3.org
1. Introduction| www.w3.org
1. Introduction| www.w3.org